A discussion is given of the application of Fourier series techniques to the problems of linearized supersonic flow. The formulation presented is an extension of the doublet type of "fundamental solution" to higher order types of singularity. The equations developed have application to wing theory but are primarily of importance in wing-body interaction problems. A specific example of a wing-body interference problem is discussed in light of the presented methods.

A report about the occurrence, distribution, and quantities of beryl and other strategic minerals in pegmatites located in the Newry Hill area, Maine.

Memorandum presenting the analysis of direct-connect performance data obtained with five flame holders of various gutter and can types operated in a 20-inch-diameter ramjet engine at Mach number 3, which revealed that the specific impulse of each of the flame holders was about the same. The combustion-chamber length had a marked effect on specific impulse. Results regarding flame-holder performance and effect of combustion-chamber length on flame-holder performance are provided.

Discussing the potential for the country of Iraq to be used as a uranium source.

Report presenting an investigation of the flow field behind a single rotor and a tandem rotor in the full-scale tunnel at a tip-speed ratio of 0.15. A chart of the flow angles and dynamic-pressure contours behind the single rotor is presented. Comparisons indicate that theory is sufficiently accurate for use in preliminary design calculations and that the flow behind a rotor is very much like the flow behind a wing.

From abstract: "There were significant increases in radioactivity in the environs of the Savanna River Plant during the period from January 1954 to July 1954. All of these increases were relatively small as compared to the maximum permissible concentration. Although fallout from Pacific tests was the main contributor to the increased activity, some of the increase was due to normal Plant operations."

Report discussing a study of samples taken from "commercially important coal beds and associated rocks in the Pottsville, Allegheny, and Monongahela series of the Pennsylvanian system". The report contains sections on the scope of the investigation, stratigraphy, radioactivity and uranium content of the coal beds and carbonaceous shale, and descriptions of the rock exposures examined.

Note presenting the rate of local heat transfer from a solid surface to a moving fluid as related to the local skin friction. This report discusses the possible range of a particular instrument in low- and high-speed flow and presents experimental data to show that a very simple instrument can be used to obtain laminar and turbulent skin-friction coefficients with a single calibration.

Report discussing a study regarding the possibility of using shock ionization as a source for mirror-type thermonuclear reactors. This was tested in a one-inch vacuum system, and though initial ionization and temperature produced was low, the magnetic field extended the time of light emission and compressed the luminous region.

Memorandum presenting the mean square slowing-down distance to indium resonance derived from the slowing-down distribution, which has been measured for water and for three water-iron mixtures for neutrons from a 0.1-gram source.

Still and motion pictures were made of boundary-layer and wake secondary-flow phenomena visualized by smoke. Two annular cascades of turbine nozzles were used, both designed for constant discharge angle but differing in blade shape and suction-surface velocity distribution. Flows were similar to those obtained with pressure and angle measurements at near-sonic airspeeds. Boundary-layer cross-channel and trailing-edge radial flows caused vortices and an accumulation of low-momentum air at the hub, which may affect flow in following blade rows. Motion of a downstream rotor blade row produced pulsations in trailing-edge radial flow. The motion-picture supplement may be obtained on loan from NACA Headquarters, Washington, D.C.

"Measurements of actual runway roughness obtained by a profile-survey method (engineer's level) are presented. Data were obtained from a survey of a relatively rough runway and a smooth runway. The results of this study are presented as roughness profiles of the runways surveyed and in the form of power spectra" (p. 1).

Report presenting a calculation of the power spectrum of relatively short wavelength turbulence in the atmosphere using measurements made in flight. The power spectral density varies with the square of the wavelength of the turbulence. Results regarding the power spectrum of gust vertical velocity, problems related to gust disturbance determination, and use of flow-direction vanes are provided.

The index of refraction of PuO2 made by thermal decomposition of PU(C2O2, 6H2O gradually increases from a value < 1.9 to 2.40 as the decomposition temperature is increased from 150 degree to l000 degree C. This change in refractive index parallels a gradual change in the x-ray diffraction pattern from weak, diffuse lines for PuO2 ignited at 150° to sharp, well resolved lines for PuO2 ignited at 1000°C. Similar results are observed for PuO2 made by thermal decomposition of Pu2(C2O4)3*11H2O. The refractive index of PuO2 made from Pu metal at 170°C is 2.40 and is not affected by further ignition at higher temperatures, although crystal growth does occur. The rate of solution of PuO2 in an HCl-KI solution is greatest for samples prepared at low temperatures and decreases markedly for oxides ignited at higher temperatures. These observations hive been interpreted to mean that ignition at higher temperatures causes a gradual perfection of the originally highly distorted and impurity-containing PuO2 lattice obtained by low temperature decomposition of the oxalates and promotes the slow growth of crystallites. Both factors decrease the reactivity of the PuO2.

Abstract: Further work has been done towards developing a high-output hydrogen ion source using the principle of the Ti ion source, the release of ions from hydrogenated titanium. It is concluded that previous efforts had resulted in the production of large quantities of low-energy ions but had failed in the attempt to accelerate a significant fraction of these. A new approach is undertaken that involves an entirely different geometry. Successfully accelerated and focused beams are obtained. Performance data and mass-analysis distributions are given. The problems of extraction and scaling are discussed. Future subjects of investigation are outlined.

Note presenting a simple technique for correcting the results of thin-wing theory near round or sharp edges at which the normal component of free-stream velocity is subsonic. The flow in planes normal to such edges is actually brought to rest, but thin-wing theory instead predicts infinite velocities.

Report presenting the results of tensile and compressive stress-strain tests at temperatures up to 1200 degrees Fahrenheit for SAE 4340, Hy-Tuf, Stainless W, and Inconel X sheet materials which were heat treated to provide ultimate tensile strengths at room temperatures. Tensile and compressive stress-strain curves are given for each material at test temperatures.

From purpose of survey: The purpose of this survey is to provide data from which to determine the suitability of portions of Camp Stewart for use as a tank firing range.

From abstract: "A composite ultrasonic unit was developed to indicate the size and location of non-bonded areas and the presence of non-transformed regions in flat uranium fuel elements clad with aluminum. A two-dimensional recorder was developed to yield instantaneous, permanent records of the non-bonded areas on electrosensitive paper. Panel lights indicate the presence of non-transformed regions that have not received proper heat treatment. Defects 1/8" in diameter are consistently detected at an inspection rate of approximately 50 sq. in./min."

Discussing the occurrence of uranium at the Colquijirca Mine, located in Peru

Note presenting data obtained for the viscosity corrections to cone probes in supersonic rarefied air flow at a nominal Mach number of 4. The test models consisted of a set of seven geometrically similar 5 degree semivertex-angle cones. Results regarding cone surface pressure distributions, calibration data for geometrically similar cones, orifices size effect, and tests at other Mach numbers are provided.

From Summary: "An investigation has been conducted in the Langley 8-foot transonic tunnel to determine the effects of several fuselage modifications on the transonic drag-rise characteristics of a 1/20-scale model of the Convair F-102 airplane. Tests covered an angle-of-attack range from 0 degrees to about 10 degrees and a Mach number range from 0.60 to 1.14."

Report presenting an investigation in the high-speed tunnel at high subsonic speeds and several angles of attack of the chordwise pressure distribution at six spanwise stations on a 45 degree sweptback, untapered vertical tail in sideslip. The presence of the horizontal tail slightly increased the value of section normal-force coefficients on the vertical tail but did not materially alter the nature of the load distribution.

From Summary: "Some of the methods of predicting rotor stability derivatives have been reviewed. The methods by which these rotor derivatives are employed to estimate helicopter stability characteristics have been summarized. It is concluded that, although these methods are not always feasible for predicting absolute values of the stability of the helicopter, the effects on stability of changes in individual derivatives can generlaly be estimated satisfactorily."